x64: Migrate br_table to ISLE (#4615)

https://github.com/bytecodealliance/wasmtime/pull/4615
2022-08-04 15:12:37 -07:00
parent b4d7ab36f9
commit cd847d071d
5 changed files with 119 additions and 92 deletions
--- a/cranelift/codegen/src/isa/x64/lower.isle
+++ b/cranelift/codegen/src/isa/x64/lower.isle
@@ -2940,3 +2940,8 @@

 (rule (lower_branch (br_icmp cc a b _ _) (two_targets taken not_taken))
      (side_effect (jmp_cond_icmp (emit_cmp cc a b) taken not_taken)))
+
+;; Rules for `br_table` ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(rule (lower_branch (br_table idx @ (value_type ty) _ _) (jump_table_targets default_target jt_targets))
+      (side_effect (jmp_table_seq ty idx default_target jt_targets)))